G751-2P1 [GMT]
Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface; 数字温度传感器和热看门狗具有双线接口
| 型号： | G751-2P1 |
| 厂家： | 
GLOBAL MIXED-MODE TECHNOLOGY INC |
| 描述： | Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface |
| 文件： | 总11页 (文件大小：269K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Global Mixed-mode Technology Inc.
G751
Digital Temperature Sensor and Thermal Watchdog
with Two-Wire Interface
General Description
Features
The G751 is a temperature sensor, Delta-Sigma
ꢀSMBus interface
analog-to-digital converter, and digital over- tem-
perature detector with SMBus interface. The host
can query the G751 at any time to read temperature.
The open-drain Over temperature Shutdown (O.S.)
output becomes active when the temperature ex-
ceeds a programmable limit. This pin can operate in
either “Comparator” or “Interrupt” mode.
ꢀProgrammable Trip Point (TOS) and Hysteresis
(THYST
)
ꢀSeparate open-drain output pin operates as
interrupt or comparator at output
ꢀRegister readback capability
ꢀPower up defaults permit stand-alone opera-
tion as thermostat
The host can program both the temperature alarm
threshold (TOS) and the temperature at which the
alarm condition goes away (THYST). In addition, the
host can read back the contents of the G751’s TOS
and THYST registers. The sensor powers up in Com-
parator mode with default thresholds of 50°C TOS
45°C THYST. for G751-1 and 80°C TOS , 75°C THYST
for G751-2.
ꢀShutdown mode to minimize power consump-
tion
ꢀUp to 8 G751s can be connected to a single
bus
Key Specifications
ꢀSupply Voltage
ꢀSupply Current
3.0V to 5.5V
280µA (typ)
1mA (max)
2µA(typ)
operating
shutdown
Ordering Information
ꢀTemperature Accuracy
-25°C to 100°C
-55°C to 125°C
±2°C (max)
±3°C (max)
TRANSPORT
PART
TOS THYST
PACKAGE
8 SOP
MEDIA
2500 Units on Tape
and Reel
G751-1P1
50°C/45°C
Applications
ꢀSystem Thermal Management
ꢀPersonal Computers
2500 Units on Tape
G751-2P1 80°C /75°C
8 SOP
and Reel
ꢀOffice Electronics
2500 Units on Tape
and Reel
G751-2P8 80°C /75°C
P1: 8 SOP; P8: 8 MSOP
8 MSOP
ꢀElectronic Test Equipment
Pin Configuration
Typical Application
+VS 3V to 5.5V
Typical Bypass 0.1 µF
(Unless mounted close
to Processor)
G751
8
7
SMBDATA
SMBCLK
O.S.
1
2
8
7
6
+Vs
A0
A0
6
5
Address(Set as
desired)
A1
A2
3
To Processor
Interrupt Line
G751
3
4
O.S. Out
A1
A2
1
2
SMBDATA
SMBCLK
Interface
5
GND
4
O.S. Set for active low for
wire OR’d multiple
interrupt line
8Pin SOP/MSOP
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 2.4
Nov 26, 2002
1
Global Mixed-mode Technology Inc.
G751
Absolute Maximum Ratings.
Operating Ratings
Supply Voltage………….…………………-0.3V to 6.5V
Voltage at any Pin……………….…-0.3V to +Vs +0.3V
Input Current at any Pin…………………………….5mA
Package Input Current…………………………….20mA
O.S. Output Sink Current………………………….10mA
O.S. Output Voltage…………………….…………..6.5V
Storage Temperature…………………-65°C to +150°C
Soldering Information, Lead Temperature
Specified Temperature Range…………….TMIN to TMAX
-55°C to +125°C
Supply Voltage Range (+Vs)…………..+3.0V to +5.5V
SOP Package
Vapor Phase (60 seconds)……………………….215°C
Infrared (15 seconds)……………………………..220°C
ESD Susceptibility
Human Body Model……………………………….2000V
Machine Model……………………………………...200V
Temperature-to-Digital Converter Characteristics
Unless otherwise noted, these specifications apply for +Vs=+3.3v Vdc. Boldface limits apply for TA=TJ=TMIN to
T
MAX; all other limits TA=TJ= +25°C, unless otherwise noted.
PARAMETER
CONDITIONS
TA=-25°C to +100°C
TA=-55°C to +125°C
TYPICAL
LIMITS
UNITS
±
2.0
3.0
Accuracy
°C (max)
±
Resolution
9
Bits
Temperature Conversion Time
100
0.25
Ms
Ma
mA (max)
SMBus Inactive
SMBus Active
Shutdown Mode
IOUT = 4.0mA
Quiescent Current
1.0
1
µA
V (max)
Conversions (min)
Conversions (max)
O.S. Output Saturation Voltage
O.S. Delay
0.8
1
6
TOS Default Temperature G751-1/G751-2
THYST Default Temperature G751-1/G751-2
50/80
45/75
°C
°C
Block Diagram
+VS 3.0V - 5.5V
8
Temperature
3
O.S.
Threshold
9-Bit Delta-Sigma
Analog-to-Digital
Converter
Set Point
Comparator
TOS Set Point
Register
Reset
Silicon
Bandgap
Temperature
Sensor
Pointer
Register
Configuration
Register
T
Set Point
HYRST egister
7
A0
6
1
2
SMBDATA
SMBCLK
Two-Wire Interface
4
A1
5
A2
TEL: 886-3-5788833
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Ver: 2.4
Nov 26, 2002
2
Global Mixed-mode Technology Inc.
G751
Logic Electrical Characteristics
Digital DC Characteristics
Unless otherwise noted, these specifications apply for +Vs=+3.3 Vdc. Boldface limits apply for TA=TJ=TMIN to
MAX; all other limits TA=TJ=+25°C, unless otherwise noted.
T
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
LIMITS
UNITS
V (min)
V (max)
V (min)
V (max)
µA
×
+Vs 0.7
VIN (1)
Logical “1” Input Voltage
+Vs + 0.5
-0.3
VIN (0)
Logical “0” Input Voltage
×
+Vs 0.3
IIN (1)
IIN (0)
CIN
Logical “1”Intput Current
Logical “0”Intput Current
All Digital Inputs
VIN=5V
VIN=0V
0.005
-0.005
20
1.0
-1.0
µA
PF
IOH
VOL
tOF
High Level Output Current
Low Level Output Voltage
Output Fall Time
VOH=5V
IOL=3ma
CL=400pF,IO=3ma
µA (max)
V (max)
ns (max)
100
0.4
250
SMBus Digital Switching Characteristics
Unless otherwise noted, these specifications apply for +Vs = +3.3 Vdc and CL (load capacitance) on output lines =
80pF unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C,
unless otherwise noted.
The switching characteristics of the G751 fully meet or exceed the published specifications of the SMBus. The
following parameters are the timing relationships between SMBCLK and SMBDATA signals related to the G751.
They are not the SMBus specifications.
SYMBOL
PARAMETER
CONDITIONS TYPICAL LIMITS UNITS
t1
t2
t3
t4
t5
SMBCLK (Clock) Period
2.5
100
0
µs (min)
ns (min)
ns (min)
ns (min)
ns (min)
Data in Set-Up Time to SMBCLK High
Data Out Stable after SMBCLK Low
SMBDATA Low Set-Up Time to SMBCLK Low (Start Condition)
SMBDATA High Hold Time after SMBCLK High (Stop Condition)
100
100
Pin Description
PIN LABEL
FUNCTION
TYPICAL CONNECTION
1
SMBDATA SMBus Serial Bi-Directional Data Line
SMBCLK SMBus Clock Input
From Controller
2
3
From Controller
Pull Up Resistor, Controller Interrupt Line
Ground
O.S.
Overtemperature Shutdown Open Drain Output
Power Supply Ground
4
GND
5,6,7
8
A0-A2 User-Set SMBus Address Inputs
Ground (Low, “0”) or +Vs (High, “1”)
DC Voltage from 3V to 5.5V
+Vs
Positive Supply Voltage Input
t1
SMBCLK
t5
t4
SMBDATA
Data in
t2
SMBDATA
Data out
t3
Logic Electrical Characteristics
TEL: 886-3-5788833
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Ver: 2.4
Nov 26, 2002
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Global Mixed-mode Technology Inc.
G751
0,1111,1010
+25°C
+0.5°C
0,0011,0010
0,0000,0001
Temperature
0,0000,0000
0°C
-55°C
1,1111,1111
1,1100,1110
+125°C
-0.5°C
1,1001,0010
-25°C
Temperature-to-Digital Transfer Function (Non-linear scale for clarity)
Default Modes
Functional Description
G751 always powers up in a known state. G751
power up default conditions are:
The G751 temperature sensor incorporates
a
band-gap type temperature sensor and 9-bit ADC
(Delta-Sigma Analog- to-Digital Converter). The
temperature data output of the G751 is available at
all times via the SMBus. If a conversion is in pro-
gress, it will be stopped and restarted after the read.
A digital comparator is also incorporated that com-
pares a series of readings, the number of which is
user-selectable, to user-programmable setpoint and
hysteresis values. The comparator trips the O.S.
output line, which is programmable for mode and
polarity.
1. Comparator mode
2. TOS set to 50°C for G751-1, to 80°C for G751-2
3. THYST set to 45°C for G751-1, to 75°C for G751-2
4. O.S. active low
5. Pointer set to “00”; Temperature Register
With these operating conditions G751 can act as a
stand-alone thermostat with the above temperature
settings. Connection to an SMBus is not required.
SMBus Interface
The G751 operates as a slave on the SMBus, so the
SMBCLK line is an input (no clock is generated by
the G751) and the SMBDATA line is a bi-directional
serial data path. According to SMBus specifications,
the G751 has a 7-bit slave address. The four most
significant bits of the slave address are hard wired
inside the G751 and are “1001”. The three least sig-
nificant bits of the address are assigned to pins
A2-A0, and are set by connecting these pins to
ground for a low, (0); or to +Vs for a high, (1).
O.S. Output, TOS and THYST Limits
In Comparator mode the O.S. Output behaves like a
thermostat. The output becomes active when tem-
perature exceeds the TOS limit, and leaves the active
state when the temperature drops below the THYST
limit. In this mode the O.S. output can be used to
turn a cooling fan on, initiate an emergency system
shutdown, or reduce system clock speed. Shutdown
mode does not reset O.S. state in a comparator
mode.
Therefore, the complete slave address is:
In interrupt mode exceeding TOS also makes O.S.
active but O.S. will remain active indefinitely until
reset by reading any register via the SMBus inter-
face. Once O.S. has been activated by crossing TOS,
then reset, it can activated again only by Tempera-
ture going below THYST. Again, it will remain active
indefinitely until being reset by a read. Placing the
G751 in shutdown mode also resets the O.S. output.
1
MSB
0
0
1
A2
A1
A0
LSB
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Global Mixed-mode Technology Inc.
G751
Shutdown Mode
Shutdown mode is enabled by setting the shutdown
bit in the Configuration register via the SMBus. Shut-
down mode reduces power supply current to 1 µA
typical. In interrupt mode O.S. is reset if previously
set and is undefined in Compatator mode during
shutdown. The SMBus interface remains active. Ac-
tivity on the clock and data lines of the SMBus may
slightly increase shutdown mode quiescent current.
TOS, THYST, and Configuration registers can be read
from and written to in shutdown mode.
*
*
*
Fault Queue
A fault queue of up to 6 faults is provided to prevent
false tripping of O.S. when the G751 is used in noisy
environments. The number of faults set in the queue
must occur consecutively to set the O.S. output.
Comparator/Interrupt Mode
As indicated in the O.S. Output Temperature Re-
sponse Diagram, Figure 1, the events that trigger
O.S. are identical for either Comparator or Interrupt
mode. The most important difference is that in Inter-
rupt mode the O.S. will remain set indefinitely once it
has been set. To reset O.S. while in Interrupt mode,
perform a read from any register in the G751.
O.S. Output
The O.S. output is an open-drain output and does
not have an internal pull-up. A ”high” level will not be
observed on this pin until pull-up current is provided
from some external source, typically a pull-up resis-
tor. Choice of resistor value depends on many sys-
tem factors but, in general, the pull-up resistor
should be as large as possible. This will minimize
any errors due to internal heating of the G751. The
maximum resistance of the pull up, based on G751
specification for High Level Output Current, to pro-
vide a 2V high level, is 30kΩ.
Figure1 O.S. Output Temperature Response Diagram
Temperature Data Format
Temperature data can be read from the Temperature,
TOS Set Point, and THYST Set Point registers; and
written to the TOS Set Point, and THYST Set Point reg-
isters. Temperature data is represented
by a 9-bit, two’s complement word with an LSB
(Least Significant Bit) equal to 0.5°C:
O.S. Polarity
The O.S. output can be programmed via the con-
figuration register to be either active low (default
mode), or active high. In active low mode the O.S.
output goes low when triggered exactly as shown on
the O.S. Output Temperature Response Diagram,
Figure 1. Active high simply inverts the polarity of the
O.S. output.
DIGITAL OUTPUT
TEMPERATURE
BINARY
HEX
0FAh
032h
001h
000h
1FFh
1CEh
192h
+125°C
+25°C
+0.5°C
0°C
0 1111 1010
0 0011 0010
0 0000 0001
0 0000 0000
1 1111 1111
1 1100 1110
1 1001 0010
-0.5°C
-25°C
-55°C
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Ver: 2.4
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Global Mixed-mode Technology Inc.
G751
Internal Register Structure
SMBDATA
SMBCLK
Interface
Data
Address
Pointer Register
(Selects register for
communication
Register Select
Configuration
Temperature
(Read-write, sets operating
Mode)
(Read-only)
Pointer = 00000000
Pointer = 00000001
TOS Set Point
(Read-write)
THYST Set Point
(Read-write)
Pointer = 00000011
Pointer = 00000010
There are four data registers in the G751, selected
by the Pointer register. At power-up the Pointer is set
to “00”; the location for the Temperature Register.
The Pointer register latches whatever the last loca-
tion it was set to. In Interrupt Mode, a read from the
G751, or placing the device in shutdown mode, re-
sets the O.S. output. All registers are read and write,
except the Temperature register which is read only.
The first data byte is the most significant byte with
most signification bit first, permitting only as much
data as necessary to be read to determine tempera-
ture condition. For instance, if the first four bits of the
temperature data indicates an overtemperature con-
dition, the host processor could immediately take
action to remedy the excessive temperatures. At the
end of a read, the G751 can accept either Acknowl-
edge or No Acknowledge from the Master (No Ac-
knowledge is typically used as a signal for the salve
that the Master has read its last byte).
A write to the G751 will always include the address
byte and the Pointer byte. A write to the Configura-
tion register requires one data byte, and the TOS and
THYST registers require two data bytes.
An inadvertent 8-bit read from a 16-bit register, with
the D7 bit low, can cause the G751 to stop in a state
where the SDA line is held low as shown in Figure 2.
This can prevent any further bus communication until
at least 9 additional clock cycles have occurred. Al-
ternatively, the master can issue clock cycles until
SDA goes high, at which time issuing a “Stop” condi-
tion will reset the G751.
Reading the G751 can take place either of two ways:
If the location latched in the Pointer is correct (most
of the time it is expected that the Pointer will point to
Temperature register because it will be the data
most frequently read from the G751), then the read
can simply consist of an address byte, followed by
retrieving the corresponding number of data bytes. If
the Pointer needs to be set, than an address byte,
pointer byte, repeat start, and another address byte
will accomplish a read.
SMBCLK
SMBDATA
A2
A1
A0
D7
D15
D14
D6
D5
D4
D3
D2
D1
D0
D13
D12
D11
D10
D9
D8
R/W
Bit
Stop
Cond
by
Ack
by
Ack
by
Ack
by
Master
Master
Start
by
G751
Master
Address Byte
Most Significant
Data Byter
Master
Master detects the error
of its ways
Intended Stop by
Master but G751 locks SMBDATA low
Figure 2. Inadvertent 8-Bit Read from 16-Bit Register where D7 is Zero
TEL: 886-3-5788833
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Ver: 2.4
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Global Mixed-mode Technology Inc.
G751
Pointer Register
(Selects which registers will be read from or written to):
P7
0
P6
0
P5
0
P4
0
P3
0
P2
0
P1
P0
Register Select
P0-P1 :Register Select:
P1
0
0
P0
0
1
REGISTER
Temperature (Read only) (Power-up default)
Configuration (Read/Write)
THYST (Read/Write)
1
0
1
1
TOS (Read/Write)
P2-P7 :Must be kept zero.
Temperature Register
(Read Only):
D15 D14 D13 D12 D11 D10
MSB Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
D0-D6 :Undefined
D9
D8
D7
D6
D5
X
D4
X
D3
X
D2
X
D1
X
D0
X
Bit 2
Bit 1
LSB
X
D7-D15 :Temperature Data. One LSB = 0.5°C. Two’s complement format.
Configuration Register
(Read/Write):
D7
0
D6
0
D5
0
D4
D3
Fault Queue
D2
O.S. Polarity
D1
Cmp/Int
D0
Shutdown
Power up default is with all bits “0” (zero).
D0 :Shutdown : When set to 1 the G751 goes to low power shutdown mode.
D1 :Comparator / Interrupt mode : 0 is Comparator mode, 1 is Interrupt mode.
D2 :O.S. Polarity : 0 is active low, 1 is active high. O.S. is an open-drain output under all conditions.
D3-D4 :Fault Queue : Number of faults necessary to detect before setting O.S. output to avoid false tripping due
to noise :
D4
0
D3
0
NUMBER OF FAULTS
1 (Power-up default)
0
1
1
1
0
1
2
4
6
D5-D7 :These bits are used for production testing and must be kept zero for normal operation.
T
HYST and TOS Register
(Read/Write):
D15 D14 D13 D12 D11 D10
D9
Bit 2
D8
Bit 1
D7
LSB
D6
X
D5
X
D4
X
D3
X
D2
X
D1
X
D0
X
MSB Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
D0-D6 :Undefined
D7-D15 :THYST Or TOS Trip Temperature Data. Power up default is TOS = 50°C /80°C for G751-1/G751-2, THYST
45°C /75°C for G751-1/G751-2.
=
TEL: 886-3-5788833
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Ver: 2.4
Nov 26, 2002
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Global Mixed-mode Technology Inc.
SMBus Timing Diagrams
G751
1
1
9
9
1
9
A1
D4
D3
1
0
0
1
A2
A0
D7
D5
D2
D1
D0
D7
D6
D6
D5
D4
D3
D2
D1
D0
R/W
Start
by
Ack
by
Ack
by
No Ack
by
Stop
Cond
by
G751
Master
Master
Master
Master
Address Byte
Most Significant Data Byte
Least Significant Data Byte
1
0
1
9
9
A1
D1
D0
1
0
0
1
A2
A0
R/W
0
0
0
0
0
Start
by
Ack
by
Ack
by
G751
G751
Master
Address Byte
Pointer Byte
1
1
1
9
9
1
9
A1
D4
D3
0
0
1
A2
A0
D7
D5
D2
D1
D0
D7
D6
D6
D5
D4
D3
D2
D1
D0
R/W
Ack
by
Ack
by
No Ack
Stop
Cond
by
Repeat
Start
by
G751
Master
Master
Master
Address Byte
Most Significant Data Byte
Least Significant Data Byte
by
Master
1
1
1
9
9
D6
D3
D2
A1
D7
D5
D4
D0
0
0
1
A2
A0
R/W
D1
Start
by
Ack
by
Stop
Ack
by
Cond
by
G751
G751
Master
Master
Address Byte
Pointer Byte
TEL: 886-3-5788833
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Ver: 2.4
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Global Mixed-mode Technology Inc.
Timing Diagrams (Continued)
G751
TEL: 886-3-5788833
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Ver: 2.4
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Global Mixed-mode Technology Inc.
Package Information
G751
C
E
H
L
D
θ
7 ° (4X)
A2
A1
A
y
e
B
8 Pin SOP Package
Note:
1. Package body sizes exclude mold flash and gate burrs
2. Dimension L is measured in gage plane
3. Tolerance 0.10mm unless otherwise specified
4. Controlling dimension is millimeter converted inch dimensions are not necessarily exact.
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN.
1.35
0.10
-----
0.33
0.19
4.80
3.80
-----
5.80
0.40
-----
0º
NOM.
1.60
-----
1.45
-----
-----
-----
-----
1.27
-----
-----
-----
-----
MAX.
1.75
0.25
-----
0.51
0.25
5.00
4.00
-----
6.20
1.27
0.10
8º
MIN.
0.053
0.004
-----
0.013
0.007
0.189
0.150
-----
NOM.
0.063
-----
MAX.
0.069
0.010
-----
0.020
0.010
0.197
0.157
-----
0.244
0.050
0.004
8º
A
A1
A2
B
C
D
E
e
H
L
0.057
-----
-----
-----
-----
0.050
-----
-----
-----
-----
0.228
0.016
-----
y
θ
0º
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Ver: 2.4
Nov 26, 2002
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Global Mixed-mode Technology Inc.
G751
A
A
8
C
E1
E
L
1
DETAIL “A”
e
2
θ
A2
A
0.076
C
R1
R
SEATING PLANE
A1
GAUGE PLANE
b
D
WITH PLATING
BASE METAL
3
c1
θ
c
L
θ1
b1
b
8 Pin MSOP Package
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN.
-----
NOM.
MAX.
1.10
0.15
0.91
0.40
0.35
0.23
0.18
3.10
3.10
MIN.
-----
NOM.
MAX.
0.043
0.006
0.036
0.012
0.014
0.009
0.007
0.122
0.122
A
A1
A2
b
b1
c
c1
D
E1
e
E
L
θ1
θ2
θ3
R
R1
-----
-----
-----
0.034
-----
0.012
0.05
0.81
0.25
0.25
0.13
0.13
2.90
2.90
-----
0.002
0.032
0.008
0.010
0.005
0.005
0.114
0.114
0.86
-----
0.30
-----
0.15
0.006
0.118
0.118
3.00
3.00
0.65 BSC
4.90 BSC
0.55
0.026 BSC
0.193 BSC
0.0217
-----
0.445
0°
0.648
6°
0.0175
0°
0.0255
6°
-----
12 REF
12 REF
-----
12 REF
12 REF
-----
0.09
0.09
-----
-----
0.004
0.004
-----
-----
-----
-----
JEDEC
MO-187AA
Taping Specification
Feed Direction
Typical SOP/MSOP Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 2.4
Nov 26, 2002
11
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